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Pay vs Performance Disclosure | 12 Months Ended
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Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($)
Pay vs Performance Disclosure [Table] |  |  |
Pay vs Performance [Table Text Block] |
|  |  |  |  |  |  |  |  |  | Value of Initial Fixed $100 Investment Based On: |  |  |  |
Year |  | Summary Compensation Table Total for PEO(1) |  | Compensation Actually Paid to PEO (2) |  | Average Summary Compensation Table Total for Non-PEO NEOs (3) |  | Average Compensation Actually Paid to Non-PEO NEOs (4) |  | Total Shareholder Return (5) |  | Peer Group Total Shareholder Return (6) |  | Net Income (in thousands) (7) |  | Core ROATE (8)
2022 |  | $ | 1,819,537 |  |  | $ | (678,861) |  |  | $ | 980,060 |  |  | $ | 168,560 |  |  | $ | 81.12 |  |  | $ | 106.01 |  |  | $ | 66,540 |  |  | 10.9 | %
2021 |  | 2,502,021 |  |  | 4,174,334 |  |  | 1,188,347 |  |  | 1,677,709 |  |  | 152.94 |  | 117.08 |  | 115,422 |  |  | 16.8 | %
2020 |  | 2,120,180 |  |  | 2,424,313 |  |  | 1,087,805 |  |  | 1,169,726 |  |  | 99.26 |  |  | 87.90 |  |  | 79,990 |  |  | 12.1 | %
Company Selected Measure Name | Core return on average tangible equity |  |
Named Executive Officers, Footnote [Text Block] | The dollar amounts represent the average of the amounts reported for our Non-PEO NEOs as a group in the “Total” column of the Summary Compensation Table in each applicable year. The Non-PEO NEOs included for purposes of calculating the average amounts in each applicable year are as follows: (i) for 2022, John M. Michel, William D, Endresen, Darrell S. van Amen and Godfrey B. Evans; (ii) for 2021, John M. Michel, William D. Endresen, Darrell S. van Amen and Erik D. Hand; and (iii) for 2020, John Michel, William D. Endresen, Darrell S. van Amen, Erik D. Hand, and Mark R. Ruh. |  |
Peer Group Issuers, Footnote [Text Block] | Represents the weighted peer group TSR, weighted according to the respective companies’ stock market capitalization at the beginning of each period for which a return is indicated. The peer group used for this purpose is the KBW Regional Banking Index ("KRX"). Assumes initial $100 investment on December 31, 2019. |  |
PEO Total Compensation Amount | $ 1,819,537 | $ 2,502,021 | $ 2,120,180
PEO Actually Paid Compensation Amount | $ (678,861) | 4,174,334 | 2,424,313
Adjustment To PEO Compensation, Footnote [Text Block] | The dollar amounts represent the amount of “compensation actually paid” to our PEO, as computed in accordance with Item 402(v) of Regulation S-K which include the following adjustments:
Year |  | Reported Summary Compensation Table Total for PEO |  | Less: Reported Value of Equity Awards (a) |  | Plus: Equity Award Adjustments (b) |  | Compensation Actually Paid to PEO
2022 |  | $ | 1,819,537 |  |  | $ | 794,978 |  |  | $ | (1,703,420) |  |  | $ | (678,861) |
2021 |  | 2,502,021 |  |  | 765,386 |  |  | 2,437,699 |  |  | 4,174,334 |
2020 |  | 2,120,180 |  |  | 506,139 |  |  | 810,272 |  |  | 2,424,313 |
(a) The grant date fair value of equity awards represents the total of the amounts reported in the “Stock Awards” column in the Summary Compensation Table for the applicable year. (b) The equity award adjustments, which are based on fair value of the related stock award (computed consistent with the methodology used for share-based payments under U.S. GAAP) as of the related vesting date or the year-end, for each applicable year include the addition (or subtraction, as applicable) of the following:
|  | (i) |  | (ii) |  | (iii) |  | (iv) |  | (v) |  |  |
Year |  | Year End Fair Value of Outstanding and Unvested Equity Awards Granted in the Year |  | Year over Year Change in Fair Value of Outstanding and Unvested Equity Awards |  | Fair Value as of Vesting Date of Equity Awards Granted and Vested in the Year |  | Year over Year Change in Fair Value of Equity Awards Granted in Prior Years that Vested in the Year |  | Subtract the Fair Value at the End of the Prior Year of Equity Awards that Failed to Meet Vesting Conditions in the Year |  |  | Total Equity Award Adjustments
2022 |  | $ | 248,494 |  |  | $ | (933,931) |  |  | $ | — |  |  | $ | (66,948) |  |  | $ | (951,035) |  |  |  | $ | (1,703,420) |
2021 |  | 1,331,918 |  |  | 1,009,191 |  |  | — |  |  | 96,590 |  |  | — |  |  |  | 2,437,699 |
2020 |  | 873,715 |  |  | 19,828 |  |  | — |  |  | (83,271) |  |  | — |  |  |  | 810,272 |
(i) The year-end fair value of equity awards granted in the applicable year that are outstanding and unvested as of the end of the applicable year. (ii) The change in the fair value of any awards outstanding and unvested as of the beginning and end of the applicable year based on the fair value at the end of the prior year and the end of the applicable year. (iii) The fair value, as of the vesting date, of any awards that were granted and vested in the same applicable year. (iv) The change in fair value of any awards granted in prior years that vested in the applicable year based on fair value at the end of the prior year and the fair value as of the vesting date; and (v) The fair value, equal to the fair value at the beginning of the applicable year, of any awards outstanding and unvested at the beginning of the applicable year that are determined to fail to meet the applicable vesting conditions during the applicable year. |  |
Non-PEO NEO Average Total Compensation Amount | $ 980,060 | 1,188,347 | 1,087,805
Non-PEO NEO Average Compensation Actually Paid Amount | $ 168,560 | 1,677,709 | 1,169,726
Adjustment to Non-PEO NEO Compensation Footnote [Text Block] | The dollar amounts represent the average amount of “compensation actually paid” to the Non-PEO NEOs as a group, as computed in accordance with Item 402(v) of Regulation S-K which include the following adjustments:
Year |  | Average Reported Summary Compensation Table Total for Non-PEO NEOs |  | Less: Average Reported Value of Equity Awards (a) |  | Plus: Average Equity Award Adjustments (b) |  | Average Compensation Actually Paid to Non-PEO NEOs
2022 |  | $ | 980,060 |  |  | $ | 197,791 |  |  | $ | (613,709) |  |  | $ | 168,560 |
2021 |  | 1,188,347 |  |  | 161,972 |  |  | 651,334 |  |  | 1,677,709 |
2020 |  | 1,087,805 |  |  | 228,816 |  |  | 310,737 |  |  | 1,169,726 |
(a) The grant date fair value of equity awards represents the average of the total amounts reported for our Non-PEO NEOs as a group in the “Stock Awards” column in the Summary Compensation Table for the applicable year. (b) The average equity award adjustments for our Non-PEO NEOs, which are based on fair value of the related stock award (computed consistent with the methodology used for share-based payments under U.S. GAAP) as of the related vesting date or the year-end, for each applicable year include the addition (or subtraction, as applicable) of the following:
|  | (i) |  | (ii) |  | (iii) |  | (iv) |  | (v) |  |  |  |
Year |  | Year End Fair Value of Outstanding and Unvested Equity Awards |  | Year over Year Change in Fair Value of Outstanding and Unvested Equity Awards |  | Fair Value as of Vesting Date of Equity Awards Granted and Vested in the Year |  | Year over Year Change in Fair Value of Equity Awards Granted in Prior Years that Vested in the Year |  | Subtract the Fair Value at the End of the Prior Year of Equity Awards that Failed to Meet Vesting Conditions in the Year |  |  |  | Total Average Equity Award Adjustments
2022 |  | $ | 61,825 |  |  | $ | (241,287) |  |  | $ | — |  |  | $ | (107,917) |  |  | $ | (326,330) |  |  |  |  | $ | (613,709) |
2021 |  | 281,862 |  |  | 311,220 |  |  | — |  |  | 58,252 |  |  | — |  |  |  |  | 651,334 |
2020 |  | 313,191 |  |  | 3,891 |  |  | 51,548 |  |  | (9,036) |  |  | (48,857) |  |  |  |  | 310,737 |
(i) The average year-end fair value of equity awards granted in the applicable year that are outstanding and unvested as of the end of the applicable year. (ii) The average change in the fair value of any awards outstanding and unvested as of the beginning and end of the applicable year based on the fair value at the end of the prior year and the end of the applicable year. (iii) The average fair value, as of the vesting date, of any awards that were granted and vested in the same applicable year. (iv) The average change in fair value of any awards granted in prior years that vested in the applicable year based on fair value at the end of the prior year and the fair value as of the vesting date. (v) The average fair value, equal to the fair value at the beginning of the applicable year, of any awards outstanding and unvested at the beginning of the applicable year that are determined to fail to meet the applicable vesting conditions during the applicable year. |  |
Compensation Actually Paid vs. Total Shareholder Return [Text Block] | Compensation Actually Paid, Cumulative Company TSR and Cumulative Peer Group TSR |  |
Compensation Actually Paid vs. Net Income [Text Block] | Compensation Actually Paid and Net Income |  |
Compensation Actually Paid vs. Company Selected Measure [Text Block] | Compensation Actually Paid and Core ROATE |  |
Total Shareholder Return Vs Peer Group [Text Block] | Compensation Actually Paid, Cumulative Company TSR and Cumulative Peer Group TSR |  |
Tabular List [Table Text Block] |
Key HomeStreet Performance Measures
1. Core ROATE
2. Core ROAA
3. Efficiency ratio
4. Core Deposit Growth
5. Nonperforming Assets to Total Assets
6. Relative TSR (compared to KRX index)
Total Shareholder Return Amount | $ 81.12 | 152.94 | 99.26
Peer Group Total Shareholder Return Amount | 106.01 | 117.08 | 87.90
Net Income (Loss) | $ 66,540,000 | $ 115,422,000 | $ 79,990,000
Company Selected Measure Amount | 0.109 | 0.168 | 0.121
PEO Name | Mr. Mason |  |
Additional 402(v) Disclosure [Text Block] | ) The dollar amounts reported in are the amounts of total compensation reported for our PEO for each corresponding year in the “Total” column of the Summary Compensation Table. Cumulative TSR is calculated by dividing the sum of the cumulative amount of dividends for the measurement period, assuming dividend reinvestment, and the difference between the Company’s share price at the end and the beginning of the measurement period by the Company’s share price at the beginning of the measurement period. Assumes initial $100 investment on December 31, 2019.The dollar amounts reported represent the amount of net income reflected in the Company’s audited financial statements for the applicable year. |  |
Measure [Axis]: 1 |  |  |
Pay vs Performance Disclosure [Table] |  |  |
Non-GAAP Measure Description [Text Block] | Core return on average tangible equity (“ROATE”) is defined as net income, excluding any amortization of intangible assets and adjusted to exclude any non-core items such as restructuring charges, merger expenses, or income from sale of branches, as a percentage of total average tangible equity, which is average equity less average intangible assets. See Appendix A for reconciliations of these non-GAAP results of operations to the nearest comparable GAAP measures. We have determined that Core ROATE is the financial performance measure that, in our assessment, represents the most important performance measure used by the Company to link compensation actually paid to our NEOs, for the most recently completed fiscal year, to Company performance |  |
Measure [Axis]: 6 |  |  |
Pay vs Performance Disclosure [Table] |  |  |
Measure Name | 6. Relative TSR (compared to KRX index) |  |
PEO [Member] | Equity Awards Reported Value [Member] |  |  |
Pay vs Performance Disclosure [Table] |  |  |
Adjustment to Compensation Amount | $ 794,978 | $ 765,386 | $ 506,139
PEO [Member] | Equity Award Adjustments [Member] |  |  |
Pay vs Performance Disclosure [Table] |  |  |
Adjustment to Compensation Amount | (1,703,420) | 2,437,699 | 810,272
PEO [Member] | Equity Awards Granted During the Year, Unvested [Member] |  |  |
Pay vs Performance Disclosure [Table] |  |  |
Adjustment To Compensation Amount, Equity Awards | 248,494 | 1,331,918 | 873,715
PEO [Member] | Equity Awards Granted in Prior Years, Unvested [Member] |  |  |
Pay vs Performance Disclosure [Table] |  |  |
Adjustment To Compensation Amount, Equity Awards | (933,931) | 1,009,191 | 19,828
PEO [Member] | Equity Awards Granted During the Year, Vested [Member] |  |  |
Pay vs Performance Disclosure [Table] |  |  |
Adjustment To Compensation Amount, Equity Awards | 0 | 0 | 0
PEO [Member] | Equity Awards Granted in Prior Years, Vested [Member] |  |  |
Pay vs Performance Disclosure [Table] |  |  |
Adjustment To Compensation Amount, Equity Awards | (66,948) | 96,590 | (83,271)
PEO [Member] | Equity Awards that Failed to Meet Vesting Conditions [Member] |  |  |
Pay vs Performance Disclosure [Table] |  |  |
Adjustment To Compensation Amount, Equity Awards | $ (951,035) | 0 | 0
Non-PEO NEO [Member] | Measure [Axis]: 1 |  |  |
Pay vs Performance Disclosure [Table] |  |  |
Measure Name | 1. Core ROATE |  |
Non-PEO NEO [Member] | Measure [Axis]: 2 |  |  |
Pay vs Performance Disclosure [Table] |  |  |
Measure Name | 2. Core ROAA |  |
Non-PEO NEO [Member] | Measure [Axis]: 3 |  |  |
Pay vs Performance Disclosure [Table] |  |  |
Measure Name | 3. Efficiency ratio |  |
Non-PEO NEO [Member] | Measure [Axis]: 4 |  |  |
Pay vs Performance Disclosure [Table] |  |  |
Measure Name | 4. Core Deposit Growth |  |
Non-PEO NEO [Member] | Measure [Axis]: 5 |  |  |
Pay vs Performance Disclosure [Table] |  |  |
Measure Name | 5. Nonperforming Assets to Total Assets |  |
Non-PEO NEO [Member] | Equity Awards Reported Value [Member] |  |  |
Pay vs Performance Disclosure [Table] |  |  |
Adjustment to Compensation Amount | $ 197,791 | 161,972 | 228,816
Non-PEO NEO [Member] | Equity Award Adjustments [Member] |  |  |
Pay vs Performance Disclosure [Table] |  |  |
Adjustment to Compensation Amount | (613,709) | 651,334 | 310,737
Non-PEO NEO [Member] | Equity Awards Granted During the Year, Unvested [Member] |  |  |
Pay vs Performance Disclosure [Table] |  |  |
Adjustment To Compensation Amount, Equity Awards | 61,825 | 281,862 | 313,191
Non-PEO NEO [Member] | Equity Awards Granted in Prior Years, Unvested [Member] |  |  |
Pay vs Performance Disclosure [Table] |  |  |
Adjustment To Compensation Amount, Equity Awards | (241,287) | 311,220 | 3,891
Non-PEO NEO [Member] | Equity Awards Granted During the Year, Vested [Member] |  |  |
Pay vs Performance Disclosure [Table] |  |  |
Adjustment To Compensation Amount, Equity Awards | 0 | 0 | 51,548
Non-PEO NEO [Member] | Equity Awards Granted in Prior Years, Vested [Member] |  |  |
Pay vs Performance Disclosure [Table] |  |  |
Adjustment To Compensation Amount, Equity Awards | (107,917) | 58,252 | (9,036)
Non-PEO NEO [Member] | Equity Awards that Failed to Meet Vesting Conditions [Member] |  |  |
Pay vs Performance Disclosure [Table] |  |  |
Adjustment To Compensation Amount, Equity Awards | $ (326,330) | $ 0 | $ (48,857)

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